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biac:analysis:topup_correction [2021/08/24 16:04] cmp12 |
biac:analysis:topup_correction [2021/08/24 18:22] cmp12 |
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the readout time in seconds for the parameter file will be: | the readout time in seconds for the parameter file will be: | ||
- | < | + | < |
+ | **For singleband images :** | ||
+ | readout = (echospacing * (acquisitionmatrix[0] * (percentsampling/ | ||
echospacing in the BXH header is in microseconds | echospacing in the BXH header is in microseconds | ||
+ | |||
+ | |||
+ | **For mutli-band images the readout calculation is more complex: | ||
+ | readout = ( ( ceil ((1/ | ||
+ | |||
+ | EffectiveEchoSpacing = TotalReadoutTime/ | ||
+ | |||
+ | AcquisitionMatrixPE = the acquisition size of the data ( acquisitionmatrix[0] ) | ||
+ | reconMatrixPE = the size of the reconstructed data ( may be different from acquisition because of FFT rules ) | ||
+ | Round_factor = 4 if partial fourier ( PFF is in scanoptions ), 2 if full fourier. | ||
+ | Asset_R_factor = the reciprocal of the first value of dcm tag (0043,1083) | ||
+ | |||
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